Process for the dyeing of artificial silk



0 e we W'ENFEZD HENTRICE, 0T5 WIiESDGRF-QN-THE-Rfifiifi, AND RUEEQLEE 1X @GHE, Q I

ERKUSiEN-ON-THE-RHINE, AND HARDTMANN, 0F VJIEQDO. GERMAENY, ASSIG-HORS TO GRASSELLI DYES'EFUFF COBPFT RATIGLFE,

Iii. All, A GUTZPQRATIQN OF DELAWARE.

FREQ-E535? FOR TEE DYEING 19F ARTIFICIAL SILK.

Ho Drawing. Application filed September 10, 1927, Serial Ho. 218,852, and in Germany fieptenzher The present invention concerns a process for the dyeing of artificial silk from ecyi celiuloses, cellulose others and conversion products thereof by means of uzo dyestuffs derived from the diazo compounds of aryl aminomonosulfonic acids, uryl amino-monocuiooxylic acids and substitution .products thereof by coupling with a, -diketo-hydrindene and derivatives thereof.

in accordance with the invention the azo dyestuffs are obtained. by coupling the diazo compounds of aryl amino-monosulfonic acids, or aryl eniino-mono-cerhoxylic acids and substitution products thereof with a, y-diketohydrindene and derivatives thereof; the resulting ezo dyestufis possess afiinity for cel lulose acetate silk or silk produced from cellulose others. Vi] hen employing the said dyestufis very pure and test dyeing are produced. dyestufis are especially Valuable for the reason that when mixed with other dyestutls in the dyeing of the said artificial silks they do not exhibit phototropic properties.

@121 invention is illustrated by the followexemple,which can be varied to suit individuel requirements or conditions of working:---

30 grains the ammonium salt of the dye- ;pu'd enilined-sulfonic ecidezo-e, y dllfie'ifihydrindene are dissolved in e litre of hot water: is carried out for shout h ur with e concentration of the dye loath of 1:30 to 12% with or Without the eddition salts, Week acids or weak elkalieset about 50. The beautiful pure yellow shedes exhibit excei-ient festness properties on cellulose ecetete silk.

Furthermore, other diezocompounds can.

cn-N=N-R 00 wherein R represents an eryl radicle of an aromatic amino containing an acid group.

3. The process of dyeing organic celluiose esters or ethcrs which comprises applying to said products dyestuffs of the general formula 2 \H-N==N,R 00

wherein R represents an sryl redicle of an aromatic amine containing a substituerit of the group comprising a czirhoxylic acid and a uic acid groupr Ahe process of dyeing orengic cellulose esters or ether-s yellow shades which comprises applying to send products e dyestufi of the 5. As an article of msnuifecture, cellulose ester or ether in eriel dyed with the dyestufi having the gs i'ormnle:

"wherein it represents en eryi redicls of? en erometic amine conteunng ecid group,

6; As an article of manufacture, organic cellulose ester or ether material dyed with the cellulose ester or ether material dyed with the dyestufl having the formula: 15 dyestuif having the general formula:

In testimony whereof we have hereunto wherein R represents an aryl radicle of an set our hands.

10 aroniatic amine containing a substituent of the group comprising a carboxylic acid and a WINFRID HENTRICH. sulfonic acid group. RUDOLF KNOCHE.

7. As an article of manufacture, organic MAX HARDTMANN. 

